The "file encoding" saves the file + metadata (filename and modification) in a "blob" format that PGP knows how to read.
Merges the file-encoder creation between RyDE and Ghostryde.
The new file - RydeFileEncoding.java - is a merge of the removed functions in
Ghostryde.java and the RydePgpFileOutputStream.java.
This is one of a series of CLs - each merging a single "part" of the encoding.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=205295756
